Dun Loireag means "the Weaver Guardian." It is the Root Town of Theta Server. The city is carved into the top of incredibly tall stone spires. Bridges made of wood planks connect the spires to each other allowing players to walk between them. Steps carved into the side of the spires allow access to higher levels of the city, which includes many benches and terraces where players can relax and enjoy the view. In the backstory of The World, Dun Loireag is a city protected by sprites with buildings made of rocks coexisting with nature. The ancient fortress of Fort Ouph floats in the sky above the city, though it's usually hidden by clouds. During the War of the Gods Dun Loireag was annihilated after the Gods destroyed Fort Ouph, causing it to crash into the city below.

This is the first place where players can find Grunties. A Grunty Farm is located on the edge of the city, and stray Grunties roam around within the town itself. Dun Loireag is prominently featured in .hack//SIGN.